Apple Wired Keyboard Cena A electric guitar pickup is basically just like an energetic mike coil. For many years, active microphones have now been wired with the style coil mounted on the primary of the microphone's transformer, and maybe not called to surface (‘floating'). The microphone's event is normally linked to the wire shield, which is linked to the mike amplifier's soil (see Rane's site for more discussion).
By and large, active microphones are extremely calm devices consequently of the mixture of transformer solitude and healthy, flying transmission lines for the duration of, along with shielded, humbucking coils.
So why don't you instruments? Instruments are notoriously plagued by noise. Humbucking pickups are only an incomplete (though essential!) solution. Well-known solution would be to float your guitar collection to a healthy output, as being a microphone. The same idea was published this 2001 patent application such as Apple Wired Keyboard Cena?